I don't think so. The comic never made a mention of a vaccine, and Kirkman has stated that it's someting like an "infinite apocalypse". That'd go too far beyond the comic canon.

Foinikas;705710 said:

Or all the last part being a mistake by Lee or a dream.

Yikes. Do you really want that to happen?

All in all, I think Lee will die. I don't want it to happen, but I can't see how he'll survive - and if he did by means of some kind of cheap bullshit reason, I'd be really disappointed. So, yeah. It's a dilemma.

Not sure...Telltale has been great at surprising us. Who would've thought that Doug/Carley would've died in episode 3? And who would've thought that a child would die? Hell, who would've thought that Lee would get bitten?